Rules and Restrictions
- Class Name:
The name of the class shall be Sunbird 25.
The class insignia shall consist of a red shaded circle 300 mm in diameter with a black flying bird superimposed on the circle.
On completion of manufacture, a class number shall be allocated by the Sunmaid Association of Victoria Inc., and it shall be displayed on the hull of the yacht and on the sails, in accordance with the requirements of Yachting Victoria. Where club sail numbers are required to be used, the class registration number shall be displayed on the hull.
A minimum crew of two, including the skipper, is required, each of whom shall be capable of manoeuvring the yacht single handed in an emergency.
- Amendments to Class Rules and Restrictions:
Amendments to the Class Rules and Restrictions may be made only at a properly constituted committee meeting of the Sunmaid Association of Victoria Inc., after prior consultation with Sunbird 25 owner-members.
- Hull and Deck:
The hull and deck shall be produced from approved moulds which have been produced in conformity with the Sunbird 25 drawings by John Brooke MRINA - Drawing No S104, October 1976. Hull and deck includes cockpit, interior, centreboard case and hatch mouldings. Lead ballast shall be as prescribed by the designer and shall be securely fixed in place. Materials for the hull shall be solid glass reinforced plastic (GRP) except that timber and other materials may be used for fitting out purposes.
The completed hull, deck, interior mouldings, ballast, centreplate, interior timberwork, engine, fuel and water tanks, mast, boom, rigging, spinnaker pole, sails, cushions, rudder, toilet and lifelines shall have a minimum mass of 1980 kg - the Yachting Victoria Mass.
Waterline marks in the form of 12 mm diameter circles in a colour contrasting with that of the hull shall be affixed to the hull on the centreline at bow and stern. The bow mark shall be located 1380 mm below the deck level, following the curvature of the bow at the centreline. The stern mark shall be located 230 mm forward of the intersection of the transom and the hull bottom, on the centreline of the hull.
A galvanised steel swing centreplate, made from 1/2" or 12 mm thick plate, shall be of a shape as prescribed by the designer. Its mass shall be approximately 67 kg. Fairing or streamlining of the plate is not permitted. Where the Sailing Instructions or Racing Rules of a body conducting any event permit, the plate may be raised whilst sailing or racing.
The rudder shall be of a swing type and hung on the transom. The rudder blade shall be of the size and shape shown on the designer's drawings. The maximum depth of the rudder blade, measured from the point where the deck and transom intersect at the centreline of the hull, shall be 2000 mm. The width of the rudder blade shall not exceed 400 mm at any point.
The mast and boom shall be manufactured from the aluminium sections prescribed.
The mast section shall be KOD (110 X 70 mm). Comalco mast section No E5406 may be used as an alternative. The length, including end fittings, shall be 8765 ± 20 mm overall. The backstay shall be attached to the masthead fitting which may also support the main halliard turning block and the topping lift.
The forestay and cap shrouds shall be attached to the mast at a point 7520 ± 20 mm above the mast base. Spreaders shall be attached to the mast at a point 3720 ± 20 mm above the mast base and shall be 695 mm in length. The inner forestay and lower shrouds shall be attached to the mast at a point 3675 ± 20 mm above the mast base. The turning block for the spinnaker halliard shall be located at a point 7890 ± 100 mm above the mast base.
The gooseneck fitting for the boom shall be fitted in such a position that the top of the boom lies 570 ± 20 mm above the cabin top when measured along the aft edge of the mast.
Two bands of colour, contrasting with the colour of the mast and not less than 20 mm wide, shall be painted on the mast at a distance of not more than 8000 mm apart. The top edge of the lower band shall line up with the upper edge of the boom when the boom is in its functional position.
The boom section shall be E5308 (90 X 55 mm). The length shall not exceed 3250 mm from the centre of the gooseneck pin to the end fitting.
A band of colour, contrasting to that of the boom and not less than 20 mm wide, shall be painted on the boom with its inner edge 3050 mm from a point where the projection of the aft side of the mast intersects the top of the boom, when the boom is in its proper position relative to the mast.
The pole section shall be a minimum of 50 mm outside diameter. When the pole is attached to its mast fitting and is held horizontal and at right angles to the centreline of the hull, the distance from the centreline of the mast to the inside of the spinnaker pole beak shall not exceed 3050 mm.
Standing rigging shall consist of forestay, backstay, cap shrouds, lower shrouds and inner forestay. The cap shroud chain plates shall be positioned on a line 3270 ± 20 mm from the bow. The lower shroud chain plates shall be positioned 380 ± 20 mm aft of the cap shroud chain plates.
Adjustment during a race is permitted only on the backstay and inner forestay. Twin forestays or other means of facilitating headsail changes shall be permitted. Minimum standing rigging size shall be 4 mm diameter.
Maximum sail dimensions, when stretched firmly by hand on the floor, shall be:-
When the mainsail is set no part of it shall be outside right angle projections from the lower edge of the upper mast band and the inner edge of the boom band, as described in Clause 9, respectively.
| Mainsail ||Luff||7925 mm|
The number of battens in the mainsail shall not exceed four and the total length of battens shall not exceed 2500 mm.
No edge of the mainsail headboard shall exceed a dimension of 120 mm.
| No 1 Genoa ||Luff||7925 mm|
The recommended dimensions for smaller headsails are:
| No 2 Genoa ||Luff||7163 mm|
| Working Jib ||Luff ||6400 mm|
| Storm Jib ||Luff||5334 mm|
| Spinnaker||Luff||8382 mm|
The following are not permitted:-
- Bowsprits or bumkins.
- Outriggers for sheeting sails.
- Any device, such as a trapeze, extending outboard to support crew members.
- Sail markings other than the insignia, registration numbers or manufacturer's trade marks.
- Reinforcement of sail corners other than as required to provide security for cringles.
- Sails manufactured from Mylar or Kevlar materials.
- Headsails fitted with battens.
- Cabin Fittings:
While racing, the following furniture shall be contained in the yacht:
- Bunk cushions.
- Table and general timber fitout.
- Auxiliary Power:
Sunbird 25's shall be fitted with either an inboard diesel engine or an outboard auxiliary engine. Outboard engines may be fitted in a well or on a transom bracket. While racing, removal of the engine from its transom bracket is prohibited.
The minimum power for an auxiliary engine shall be 6 horsepower (4.48 KW).
- Class Basic Handicap Measurements:
Deviation from the current, published Class Basic Handicap (Yachting Victoria) measurements for the Sunbird 25 is not permitted.
Current Australian Yachting Federation " Special Regulations for Racing Boats" shall apply in all races. The category shall be specified in the Sailing Instructions for the particular race or series. In addition to the AYF regulations it is a requirement of the Sunmaid Association of Victoria Inc. that all Sunbirds be fitted with:-
- an effective boarding ladder.
- Pushpit, pulpit and lifelines which comply with AYF "Special Regulations for Racing Boats"
- Effective locking devices on both cockpit lockers. These locks must be secured at all times the storm boards are in place.
The Association reserves the right for its committee to grant temporary dispensation to yachts not meeting these Rules and Restrictions. Such dispensation will only be granted for minor deficiencies and shall apply only for a particular race or series.
The Sunbird Rules and Restrictions were originally prepared in August 1984. An amendment allowing the use of an alternative mast section was made in March 1988. Reprinted and edited in September 2004.